The following are chemical processes:
- rusting of a nail
- decomposition of water into hydrogen and oxygen gases
A chemical process always results in the formation of a new substance. It is not easily reversible and heat is absorbed or evolved in the process.
The rusting of a nail is a chemical change in which hydrated Iron III oxide is formed. This changes the appearance and texture of the nail. An image of a rusted nail is attached to this answer.
The decomposition of water forms hydrogen and oxygen hence it is a chemical change.
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